As per above,
You will need to edit the UVSCALE - right click on your object and select its material.. In the window at the top right hover over the icons to UVScale, you will need to select Channel 0 to edit the road texture and change it to how you want it.
View attachment 19475
This will change the objects material details in 3dsimed (the mapping on the object).. You will then need to "Export" the object back into your track folder (Overwrite the GMT) with the updated uvmap version.The GMT file contains your object XYZ points, Polygons and all material mapping details.
(A UVMap) is the XY mapping of a texture onto an object.. (how it is aligned and positioned on an object) UVScale, will scale the texture on that object.. (Selecting 0.5 will halve it Make it bigger), selecting (2) will double the mapping scale (Effectively making it smaller) doing it by 0.1 or 10 will do the same but 10x.
Note: Scale will be at zero next time you load the object in as 3dsimed assumes what you loaded in is zero scaled. So dont look for the change in the object.. it should visually load in differently if you exported it over the old version of that object. Channel 1,2 and 3 will remember the details as they are a scale of channel zero.. so if you make 0 ten times smaller, but want to keep channel 1 the same you will need to make it bigger to offset.
If you wish to then edit other channels on the race surface and edit them you will need to do the same channel for the other underlying levels (Ie realroad level and marbles layers)
Details of the channels for road below (from TrackTechology V3)
(Now looking at this - i suspect channel zero is a global scale) where you maybe able to edit channel 1,2 and 3 directly and they will retain their scale in relation to channel zero... so you could leave channel zero and just edit channel 1,2,3 accordingly. (i would need to test this)
View attachment 19474
As an alternative, you can export the road object into a 3d editor format, edit it, load it into GJEd and export a new GMT - Which is much easier and you can edit it visually and look at the results.